Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J5/00—Normal steroids containing carbon, hydrogen, halogen or oxygen, substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane and substituted in position 21 by only one singly bound oxygen atom, i.e. only one oxygen bound to position 21 by a single bond
  • C07J5/0046—Normal steroids containing carbon, hydrogen, halogen or oxygen, substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane and substituted in position 21 by only one singly bound oxygen atom, i.e. only one oxygen bound to position 21 by a single bond substituted in position 17 alfa
  • C07J5/0053—Normal steroids containing carbon, hydrogen, halogen or oxygen, substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane and substituted in position 21 by only one singly bound oxygen atom, i.e. only one oxygen bound to position 21 by a single bond substituted in position 17 alfa not substituted in position 16
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J51/00—Normal steroids with unmodified cyclopenta(a)hydrophenanthrene skeleton not provided for in groups C07J1/00 - C07J43/00

Definitions

• This invention relates to new process of preparing steroid compounds and intermediate compounds as well as process of preparing same.
• compound VII 2-bromo-6 ⁇ ,9 ⁇ -difluoro-11 ⁇ ,17 ⁇ ,21-trihydroxy-1,4- pregnadien-3,20-dione-17, 21-diester
• U. S. Patent 4,226,862 describes that the compound VII has valuable pharmaceutical activity such as anti-inflammatory activity or anti-rheumarthritic activity, and that the compound VII rarely has side effects, such as decrease in body weight, accumulation of sodium, decrease in potassium, or suppression of adrenal glands and hypophysis, which would often be observed with various conventional steroids having physiological activity.
• the other investigation reported that the compound VII can be administered by intra-articulational injection and thus it is an effective anti-rheumatic agent.
• European Patent 97328 and U. S. Patent 4,525,303 disclose a method of preparing the compound VII using hydrocortisone-21-ester which is readily,available as a starting compound. This method comprises the steps of; (1) dehydration of a hydroxy group at the 11-position of the starting compound, (2) acetylation of a hydroxy group at the 17-position, (3) bromhydrination at the 11-position, (4) epoxidation at the 11-position with a base, (5) cleavage of the epoxy compound with hydrogen fluoride, (6) oxidation of the hydroxy group at the 11-position, (7) ketalation, (8) reduction of the hydroxy group at the 11-position, (9) epoxidation of the double bond between the 5-position and the 6-position with a peracid, (10) cleavage of the epoxy compound with hydrogen fluoride.
• 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,17 ⁇ ,21-trihydroxypregna-3.11,20- trione-17,21-diesters or 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxypregna3,20-dione-17,21-diesters can be synthesized from the starting compound above and then the compound VII can be prepared from the diesters above by the following steps; (11) dibromination at the 2-position of the diesters, (12) dehydrobromination and dehydration in an amide solvent in the presence of a metal halide at high temperature.
• dibromide compound can be obtained through monobromide compound, when the diesters and a large amount of bromine are reacted at high temperature for a short period time.
• the dibromide compound cannot be prepared stably with high quality and yield, because a great deal of bromine cannot be poured quickly into the reaction system, and because the dibromide compound in which the bromine has been transferred from the 2-position to the 4-position is produced as impurity in the dibromination.
• the above method is found disadvantageous in that the compound VII cannot be produced stably with high quality and yield, because the completion of reaction in step (12) depends on the purity of the dibromide compound produced in step (11), and because the dibromide compound tends to be decomposed with hydrogen bromide and water produced as impurity since the reaction proceeds at high temperature in step (12).
• the above method also, has a problem of taking much time to purify the crude compound VII.
• the above method is inadequate for preparing the compound 10 on an industrial scale or on the occasion of scaling up.
• OR 1 and OR 2 independently represent an ester residue, which comprises reacting with hydrogen chloride, or with thionyl chloride in the presence of
• this invention provides a compound represented by general formula (I) wherein Y and Z together as -Y-Z- represent a -(PpSe)CH-CH 2 -group where Pp represents a phenyl group or a 2-pyridyl group, or Y and Z each represent an ethenylene (or vinylene) group or a 1-bromoethenylene (or bromovinylene) group; and W, X, OR 1 and OR 2 have the same meanings as defined above.
• this invention provides a process of preparing a compound of formula (I), which comprises reacting 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,17 ⁇ ,21-trihydroxypregna-3,11,20-trione-17, 21-diesters or 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxypregna-3,20-dione-17,21-diesters as a starting compound with an organic selenenyl halide selected from the group consisting of 2-pyridylselenenyl chloride, 2-pyridylselenenyl bromide, phenylselenenyl chloride and phenylselenenyl bromide.
• an organic selenenyl halide selected from the group consisting of 2-pyridylselenenyl chloride, 2-pyridylselenenyl bromide, phenylselenenyl chloride and phenylselenenyl
• the compounds (I) of the present invention are useful as an intermediate for producing 6 ⁇ ,9 ⁇ -difluorocorticoids which has pharmacological activity and are important as an intermediate for producing the afore-said compound VII.
• the ester residue is an acyloxy group, a sulfuric ester group or a phosphoric ester group.
• the sulfuric ester group and phosphoric ester group are derived from sulfuric acid and phosphoric acid, respectively.
• the acyloxy groups represented by OR 1 and OR 2 generally contain 1 to 20 carbon atoms, preferably 1 to 16 carbon atoms, and examples thereof include a formyloxy group, an acetoxy group, a malonyloxy group, a benzoyloxy group, a cinnamoyloxy group, etc.
• Organic acids such as aliphatic carboxylic acids, alicyclic carboxylic acids, aromatic carboxylic acids, arylaliphatic carboxylic acids, heterocyclic carboxylic acids, thiocarboxylic acids, amino carboxylic acids can be used as an acid which consitutes the acyloxy group represented by OR 1 or OR 2.
• the carboxylic acids include formic acid, acetic acid, chloroacetic acid, trifluoroacetic acid, propionic acid, butyric acid, valeric acid, trimethylacetic acid, diethylacetic acid, caproic acid, crotonic acid, enanthic acid, caprylic acid, palmitic acid, undecanoic acid, undecylenic acid, oxalic acid, succinic acid, glutaric acid, pimelic acid, tartaric acid, maleic acid, lactic acid, carbamic acid, glycine, alkoxylcarboxylic acids, hexahydrobenzoic acid, cyclopentylpropionic acid, cyclohexylacetic acid, cyclohexylbutyric acid, benzoic acid, phthalic acid, phenylacetic acid, phenylpropionic acid, furan-2-carboxylic acid, nicotinic acid and isonicotinic acid.
• the carboxylic acids include acetic acid, trimethylacetic acid, propionic acid, ⁇ -phenylpropionic acid, «-phenylpropionic acid, valeric acid, dicarboxylic acids such as succinic acid.
• the sulfonic acids preferably include methanesulfonic acid and toluenesulfonic acid.
• the above acyloxy groups ' represented by OR 1 are formed preferably by the carboxylic acids because the ester group at the 21-position in the general formula (I) has superior biological activity.
• the OR' represents preferably polycarboxylic esters, water-soluble salts thereof or inorganic acids which can be converted into the water-soluble salts.
• the compounds of this invention can be prepared according to the following reaction schemes.
• a steroid compound represented by the general formula (II) above is reacted with an organic selenenyl halide selected from the group consisting of 2-pyridylselenenyl chloride, 2-pyridylselenenyl bromide, phenylselenenyl chloride and phenylselenenyl bromide in an organic solvent at a temperature preferably from 0° C to 50° C to form compound represented by the general formula (III) above.
• the compound represented by the general formula (III) is oxidized with an oxidizing agent in an organic solvent at a temperature preferably from -50 °C to +30 °C to obtain a compound represented by the general formula (IV) above.
• the compound (IV) is brominated with bromine in an organic solvent inert to bromine at a temperature preferably from -40 ° C to + 50 ° C to form a compound represented by the general formula (V) above.
• the compound (V) is then reacted with thionyl chloride, or with thionyl chloride in the presence of a basic compound, at a temperature preferably from -30 °C to + 50 °C to form a compound represented by the general formula (VII) when the compound (V) contains a hydroxymethylene group of ⁇ -arrangement at the 11-position, i.e., when > W-X represents a hydroxymethylene group of ⁇ -arrangement.
• the compound (V) is reduced with a reducing agent in an organic solvent at a temperature of preferably from -80° C to + 60 C.
• the symbol- at the 2-position indicates that the group attached to the 2-position may be a-or ⁇ -arrangement or a mixture of such ⁇ - and ⁇ -isomers can be used.
• those compounds in which R' and R 2 each represent an acetyl group can be prepared using the compound of the general formula (Ila) as a starting compound by the following procedure.
• the starting compound is 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,17 ⁇ ,21-trihydroxypregna-3,11,20-trione-17,21-diacetate (Compound Ila).
• Pp represents a 2-pyridyl group
• R 1 and R 2 have the same meanings as defined above.
• the compound (Ila) and 2-pyridylselenenyl chloride or 2-pyridylselenenyl bromide are reacted in an organic solvent (e.g., halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane, ethers such as tetrahydrofuran, dioxane, esters such as ethyl acetate, methyl acetate, amides such as dimethylformaldehyde, N-methylpyrrolidone) at a temperature depending on the solvent used, preferably from 0°C to 50 C, to form the compound of general formula (Illa) of this invention.
• organic solvent e.g., halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane, ethers such as tetrahydrofuran, dioxane, esters such as ethyl acetate, methyl acetate, amides
• the compound (Illa) represents 6 ⁇ ,9 ⁇ -difluoro-2-(2-pyridylseleno)-5 ⁇ ,17 ⁇ ,21-tri-hydroxypregna-3,11,20-trione-17,21-diacetate.
• phenylselenenyl chloride or phenylselenenyl bromide can be used instead of 2-pyridylselenenyl chloride or 2-pyridylselenenyl bromide.
• the compound (Ila) is reacted with triethylamide and trimethylsilane chloride in nitriles such as acetonitrile in the presence of zinc chloride anhydrolide, and then the product is reacted with phenylselenenyl chloride or phenylselenenyl bromide.
• the compound (II) can be reacted directly with phenylselenenyl chloride in a solvent such as ethyl acetate.
• the thus-obtained compound of this invention represents 6 ⁇ ,9 ⁇ -difluoro-2-phenylseleno-5 ⁇ ,17 ⁇ ,21-trihydroxypregna-3,11,20-tri-one-17,21-diacetate.
• R 1 , R 2 and Pp have the same meanings as defined above.
• the compound (Illa) and an oxidizing agent e.g., hydrogen peroxide, metachloroperbenzoic acid. sodium periodate, peracetic acid, ozone, N-bromosuccinimide, N-chlorosuccinimide
• an organic solvent e.g., halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane, alcohols such as methanol, ethanol, esters such as ethyl acetate, methyl acetate, and acids such as acetic acid
• an organic solvent e.g., halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane, alcohols such as methanol, ethanol, esters such as ethyl acetate, methyl acetate, and acids such as acetic acid
• the compound (IVa) of this invention represents 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,17 ⁇ ,21-trihydroxy-1-pregne
• R 1 and R 2 have the same meanings as defined' above.
• the compound (IVa) and bromine are reacted in any organic solvent that does not react with bromine, at a temperature of preferably from -40° C to +50° C, to form the compound of general formula (Va).
• the compound (Va) of this invention represents 2-bromo-6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,17 ⁇ ,21-trihydroxy-1-pregnen-8,11,20- trione-17,21-diacetate.
• a basic compound e.g., trimethylamine, pyridine and collidine
• the reaction can be promoted effectively because hydrobromide obtained as impurity can be captured by the assistant above.
• R 1 and 2 have the same meanings as defined above.
• the compound (Va) and thionyl chloride are reacted in the presence of a basic compound (e.g., preferably amines such as triethylamine, trimethylamine, pyridine and collidine) in any organic solvent that does not react with thionyl chloride, at a temperature of preferably from -30 C to +50°C, to form the compound of general formula(VI).
• a basic compound e.g., preferably amines such as triethylamine, trimethylamine, pyridine and collidine
• the compound (Va) and hydrogen chloride can be reacted in any organic solvent that does not react with hydrogen chloride, at a temperature of preferably from -30 °C to +50°C, to form the compound (VI).
• the compound (VI) represents 2-bromo-6 ⁇ ,9 ⁇ -difluoro-17a,21-dihydroxy-1,4-pregnadien-3,11,20-trione-17, 21-diacetate.
• R 1 and R 2 have the same meanings as defined above.
• the compound (VI) and a metal hydride are reacted in an organic solvent (e.g., ethers such as benzene, tetrahydrofuran, dioxane and dimethoxyethane, halogenated hydrocarbons such as methylene chloride, chloroform and dichloroethane, and alcohols such as methanol, ethanol and isopropanol) at a temperature depending on the solvent and the metal hydride, preferably from -80° C to +60° C, to form'the compound of general formula (VII).
• organic solvent e.g., ethers such as benzene, tetrahydrofuran, dioxane and dimethoxyethane, halogenated hydrocarbons such as methylene chloride, chloroform and dichloroethane, and alcohols such as methanol, ethanol and isopropanol
• Examples of the above hydride include metal aluminum hydrides such as lithium aluminum hydride and sodium aluminum bis(2-methoxyethoxy)hydride, metal boron hydrides such as sodium boron hydride and lithium boron hydride and the like.
• metal aluminum hydrides such as lithium aluminum hydride and sodium aluminum bis(2-methoxyethoxy)hydride
• metal boron hydrides such as sodium boron hydride and lithium boron hydride and the like.
• the compound (VII) represents 2-bromo-6 ⁇ ,9 ⁇ -difluoro-11 ⁇ ,17 ⁇ ,21-trihydroxy-1,4-pregnadien-3,20-dione-17,21-diacetate.
• those compounds in which R 1 and R 2 each represent an acetyl group can be prepared using the compound of the general formula (IIb) as a starting compound by the following process.
• the starting compound used is 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxypregna-3,20-dione-17,21-diacetate.
• Pp represents a 2-pyridyl group
• R 1 and R 2 have the same meanings as defined above.
• the compound (Ilb) and 2-pyridylselenenyl chloride or 2-pyridylselenenyl bromide are reacted in a solvent (e.g., those used in Preparation Step 1 above) at a temperature depending on the solvent used, preferably from 0°C to 50°C. to form the compound of the general formula (IIIb).
• a solvent e.g., those used in Preparation Step 1 above
• the compound (IIIb) of this invention represents 6 ⁇ ,9 ⁇ -difluoro2-(2-pyridylseleno)-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxypregna-3,20-dione-17,21-diacetate.
• Phenylselenenyl chloride or phenylselenenyl bromide can be used instead of 2-pyridylselenenyl chloride or 2-pyridylselenenyl bromide as well as Preparation Step 1.
• the obtained compound of this invention represents 6 ⁇ ,9-difluoro-2-phenylseleno-5 ⁇ ,11 ⁇ ,17 ⁇ ,21- tetrahydroxypregna-3,20-dione-17,21-diacetate.
• the above compound (Illb) and an oxidizing agent are reacted in a solvent (e.g.,those used in Preparation Step 2) at a temperature depending on the oxizing agent and the solvent used, preferably from -50°C to +30°C. to obtain the compound of the general formula (IVb).
• a solvent e.g.,those used in Preparation Step 2
• the compound (IVb) of this invention represents 6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxy-1-pregnen-3,20-dione-17, 21-diacetate.
• the compound (IVb) is further reacted with bromine in any organic solvent that does not react with the bromine, at a temperature of preferably from -40°C to +50°C. to form the compound of the general formula (Vb).
• the compound (Vb) of this invention represents 2-bromo-6 ⁇ ,9 ⁇ -difluoro-5 ⁇ ,11 ⁇ ,17 ⁇ ,21-tetrahydroxy-1-pregnen-3,20-dione-17, 21-diacetate.
• a basic compound e.g., those used in Preparation Step 3
• the thus-obtained compound (Vb) and thionyl chloride are reacted in the presence of a basic compound (e.g.,those used in Preparation Step 4) in any organic solvent that does not react with thionyl chloride, at a temperature of preferably from -30 C to 150° C, to obtain the aforedescribed compound (VII).
• a basic compound e.g.,those used in Preparation Step 4
• any organic solvent that does not react with thionyl chloride at a temperature of preferably from -30 C to 150° C
• the above compound (Vb) and hydrogen chloride are reacted in any organic solvent that does not react with hydrogen chloride, at the same temperature as above, to form the compound (VII).
• Compound (IIIb) (1.24 kg, yield: 95%) was prepared using 1 kg of compound (Ilb) as a starting compound in the same manner as the process in EXAMPLE 1.
• the compound (IIIb) obtained had a melting point of 211 to 212° C and crystals thereof were white.
• Compound (lVb) (0.43 kg, yield: 85.7%) was prepared from 0.66 kg of compound (IIIb') in the same manner as the process in EXAMPLE 2. The compound obtained had the same characteristics as the compound obtained in EXAMPLE 7 had.

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• 1988
  • 1988-05-03 US US07/189,849 patent/US4874855A/en not_active Expired - Fee Related
  • 1988-05-05 EP EP88107227A patent/EP0314864A1/de not_active Ceased

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